Diquat is a conductive herbicide, and paraquat is a quick-acting herbicide. Diquat is used to weed orchards, fields and non-cultivated land before harvesting, and to dry the stems and leaves of potatoes and sweet potatoes. It also has a certain effect on perennial underground rhizomes. Paraquat is mainly used to remove weeds and needs directional spraying. It will be passivated in soil and has no effect on plant roots and perennial underground rhizomes.